G - Physics
05
D
341/32.31
G05D 23/24 (2006.01) G08B 17/06 (2006.01) G08B 21/18 (2006.01)
Patent
CA 1142247
Abstract of the Disclosure A thermostat monitoring and controlling the temperature of produce ripening within an enclosure and featuring a bridge circuit sensing errors between the actual and desired temperatures in which the desired temperature is selected directly in units of degrees. A bridge ampli- fier having feedback maintains the bridge in electrical balance, to avoid errors due to changes in bridge component self heating. An error detection circuit having a single control simultaneously selects upper and lower error limits centered on the desired temperature, in units of degrees, The circuit indicates whenever the actual temperature goes outside these limits. An alarm circuit indicates a tempera- ture error or a power failure in the thermostat at the thermostat and at a remote location. This circuit utilizes an alternating current source which activates current direction-dependent indicators operating on alternate half cycles. electrical isolation of the temperature monitoring circuitry from the circuitry controlling heating, cooling and fan equipments is provided by coupling a signal indicating a temperature error through a single electrically isolating interface to equipment selection and control circuitry at line potential.
322648
Campbell John E.
Hughes Paul R.
Smart & Biggar
United Brands Company
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